If you provide us with specific instances where aircraft are crashing an UN-modded game we'll have a look and fix any problems if we find any. We need to know the exact scenario you're seeing the crash as there are many, many factors at work that could potentially cause a crash. The more detail you provide the better the chance we'll be able to reproduce what you're seeing. We have to be able to reproduce it in order to be able to fix it. If we have no way of seeing a problem we cannot know how to fix it.